Hole spotter



Jan. 1935- H. J. SCHORLE 1,986,290

HOLE sPoTTEfi FiledApril 12, 1934 JJa/zorle I NVENTOR BY M 'A TTORNE Y Patented Jan; 1, 1935 HOLE s'ro'r'mn Herman J. Schorle, Astoria, Long Island, Y., assignor to Worthington Pump and Machinery Corporation, New York, ,N.

Virginia Y., a corporation of Application April 12, 1934, Serial No. 720,197

9 Claims. (C1, 255'45) This invention relates to rock drilling equipment and more particularly to a hole spotter for guiding drill rods. I

An object of the present invention is to provide a hole spotter with means for readily attaching it to and detaching it from thesheIl of a rock drill.

Another object is toprovide a hole spotter appear from the accompanying specification,

the invention consists 'of various features of construction and combination of parts, which will be first described in connection with the accompanying drawing, showing a hole spotter of the preferred form, and the features forming the invention will be specifically pointed out in the claims.

In the drawing:

Fig. 1 is a longitudinal cross sectional view showing the preferred form of the invention attached to the shell of a rock drill.

Fig. 2 is a top plan view of the improved spotter showing the spotter fingers embracing the drill steel in the guiding position; broken lines indicate the spotter inthe disengaged posi tion. 1

Fig. 3 is a cross sectional view taken on the lines 3-3 of Fig. 1. A

Fig. 4 is a cross sectional view taken on the lines 44 of Fig. 1.

Referring again to the drawing, the improved spotter comprises an attaching and'supporting member 10 terminating in a collar 11 and secured rigidly to the shell of a rock drill A asby a stud or other suitable mounted means. 12. A, plate 13 engages the shell of the rock drill A and inhibits rotative movement of the hole spotter about the stud 12. The rock drill is equipped with a drill steel, drill bar or other suitable percussive tool B.

The supporting member 10 is provided at its outer extremity with a cylindrically bored spotter guide 14 whose axis is perpendicular to and coplanar with the axis of the drill steel. The spotter 15 has a cylindrical shank 16 shaped to conform closely with the inner diameter of the spotter guide 14.a nd is provided at its upper extremity with a paiaxof parallel lugs or spotting .volved in the guide 14 to the position indicated fingers 17 grooved as at 18 to accommodate the drill steelB.

An adjusting and locking bracket 19 has a collar 20 at its lower end which slides in the spotter guide 14. when the spotteris in operating 5 position. The collar closely engages a flattened post 21 of reduced diameter depending from the shank 16. To obtain a good fit between the parts'the interior contour of the collar 20 is made to conform closely with'the outer contour of the post 21. A- taper pin or other fastening means 22 firmly secures the adjusting bracket 19 to the spotter 15 and prevents relative axial motion between the two-parts. When the spotter is in the operating position the pin is firmly held inside the spotter guide 14 and cannot be removed. I v

The spotter guide 14 is p'rovided with a right angled groove or bayonet slot 23. The upper or horizontal, portion of the slot extends circumferentially about the guide and circumscribes the wall of the spotter guide 14 through an arc sufiicient to allow the spotter fingers to clear the drill bar when swung into the disengaging position. In the preferred formv shown in the drawing, an arc of sixty degrees has been found satisfactory. The horizontal groove or slot 23 communicates with another groove extending axially down the side of the wall of the guide and is at .right angles to the horizontal portion. Each extremity of the'right angled groove has a slightly deeper recess or well 24. The bracket 19 terminates at its upper end with a sleeve 25 fitted with a plunger 26 actuated by a cap 27 secured to the plunger and normally urged inwardly by a spring 28. The plunger 26 engages the walls of the slot 23 and controls the motion the collaring operation; The entire structure is held rigid and secure by the engagement of the plunger 26 in the upper recess 24.

When the collaring operation has been completed and it is desired to swing the spotter from the engaged position the plunger is moved from the recess 24 lifting out the cap 26 on the plunger rod. This allows the spotter to be reby broken lines. The fingers being clear of the ,drill steel, the spotter may be retractedby slid-'- ing the shank 16 axially in the spotter. guide 14 until the plunger 26 becomes engaged in the lowerrecess 24 to lock the spotter in the free 55 or disengaged position during the hole finishing operations.

Rigidity ispromoted by fitting the spotter shank 16 closely in the spotter guide 14 and by providing the post 21 with flattened taces as shown in Fig. 4:. The flattened faces-allow for a more even distribution of torsional stresses and there is little tendency to shear the pin 22. When the spotter is in the engaged position the pin '22 moves inside the spotter guide 14 which prevents the'pin from becoming dislodged.

It will be understood that the invention is not to be limited to the specific construction or arrangement of pants shown, but that these maybe modified widely within the invention-as defined by the claims, fI.--

What is claimed is 1. In a hole spotter, the combination with a drill bar, of attaching ,and'supporting means, a spotter guide perpendicular to and coplanar with said drill bar, spotting fingers adapted to embrace said drill bar, a shank secured to said fingers andco-axial with said guide, and an adju's'ting bracket secured to the lower end of said shank.

2. In a hole spotter, the combination with a drill bar, of attaching and supporting means, a spotter guide perpendicular to and coplanar with said drill bar, spotting fingers adapted to embrace said drill bar, a shank secured to said fingers and co-axial with said guide, an adjusting bracket secured to the lowerend of said shank, and means extending from said bracket for controlling the position of said spotter.

3. In a hole spotter, the combination witha drill bar, of attaching and supporting means, a spotter guide having an axis perpendicular to and coplanar with the axis of said drill bar, said guide being provided with a slot extending part way through the outer wall of said guide, a spotter movable in said guide, an adjusting bracket secured to said spotter, and means extending from said bracket and engaging the walls of said slot for controlling the movement of said spotter in said guide.

4. In a hole spotter, .the combination with a drill bar, of attaching and supporting means, a

spotter guide having an axis perpendicular to and coplanar with the axis of said drill bar, said guide being provided with a right-angled slot extending part way through the outer wall of said guide, said slothaving a horizontal portion extending circumterentially about the walls of the spotter guide, and a vertical portion depending axially with respect to said guide, a spotter movable in said guide, a supporting bracket secured to said spotter, and means extending from said bracket and engaging the walls of said rightangled slot for controlling the movement of said spotter.

5. In a hole spotter, the combination with a drill bar, of attaching and supporting means, a spotter guide'havingan axis perpendicular to and coplanar with the axis of said drill bar, said guide being provided with a right-angled slot extending part way through the outer wall of said guide,.said slot having a horizontal portion. extending circumferentially about the wall gf the spotter guide, and a vertical portion depending axially with respect to said guide, the terminals of said slot being provided with recesses, a spotter movable in said guide, a supporting bracket secured to said spotter, and means extending from said bracket and engaging the walls of said right-angled slot during movement of said spotter and engaging in said recesses at ated slot-engaging means extending from said bracket and engaging the walls of said rightangled slot during movement of said spotter and snapping into'said recesses to automatically lock said spotter with respect to said guide when said spotter is in full engaging and full disengaging positions respectively.

'7. In a hole spotter, the combination with a drill bar, of attaching and supporting means, a spotter guide perpendicular to and coplanar with said drill ,bar, spotting fingers adapted to embrace said drill bar,'a shank secured to said fingers and co-axial with said guide, a post of reduced diameter depending from said shank, an adjusting bracket exterior of said guide, and'a collar at the lower extremity of said bracket encircling said post.

8. In a hole spotter, the combination with a drill bar, of attaching and supporting means, a

.said guide, and means for locking said collar to said post.

' 9. In a hole spotter, the combination with a drill bar, of attaching and supporting means, a spotter guide perpendicular to and coplanar with .said drill bar, spotting fingers adapted to embrace said drill bar, a shank secured to said fingers and co-axial with said guide, a post of reduced'diameter depending from said shank, said post having flattened side portions, an adjusting bracket exterior of said guide, a collar at the lowerextremity of said bracket, said collar having an interior contour corresponding with the outer contour of said post and an outer contourcorresponding with the interior contour of said guide, andpin connecting means for locking bracket secured to said spotter and spring actusaid collar to, said post, said pin connecting meansandi said collar being held inside and engaging thewalls'of.said spotter guide when said spotter ,i sair'r the operating position. 1 g

, HERMAN J. SCHORLE. 

